St. Thomas Employees Control Group

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I am proposing on a plan with St. Thomas Employees.  The client is a control group with 1 Company in the US and 2 companies in St. Thomas.  They have a 401(k)/SHBM plan and have allowed the St. Thomas employees to adopt the plan.  In order to receive certain tax deductions the client must provide a Contribution to the St. Thomas employees and would treat this as a PS contribution.  My thought is to separate the plans as long as coverage tests pass as the owner wants to max out his contribution.  Any thoughts?  Has anyone worked on a plan with St. Thomas employees?